I'm going to guess the Drudge Report made a huge contribution.
Drudge is a source of news many people on the right trust. And he writes in the sensational way they are used to. So he can break through in the way a Dem cannot. And recently he's been absolutely savage towards Trump.
Not sure how it will break downticket. But at the top, Trump has been Drudge's punch bag. So it may be that he's pushed a lot of folks across the great divide.